It is a noble gas
a) chlorine b) calciumc) radon d) oxygen
BacchuBHAU:
its radon
ok
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radon I think bro.....
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Radon is the noble gas.
These type of gases are the one that has similar properties and are a part of chemical elements with the standard condition.
Some of the conditions followed by this group are low chemical reactivity, monatomic gas, colourless and odourless.
In addition to this, radon is also a radioactive gas.
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